To use ULN, you need to obtain a ULN login and register the machine
used for installation with ULN. This is described in detail in the
ULN FAQ.
The page also describes how to install and update packages.The MySQL
packages are in the “MySQL for Oracle Linux 6” channel
for your system architecture on ULN.

Note

At the time of this writing, ULN provides MySQL 5.5
for Oracle Linux 6.

If you're updating an existing MySQL installation to an installation
using ULN, the recommended procedure is to export your data using
mysqldump, remove the existing installation,
install MySQL from ULN, and load the exported data into your freshly
installed MySQL.

If the existing MySQL installation you're upgrading from is from a
previous release series (prior to MySQL 5.5), make sure
to read the section on upgrading MySQL, Section 2.11.1, “Upgrading MySQL”.